Bip39 Vs Bip44 To make a seed phrase this way, you'll need a calculator that features a RANDOM function (for making entropy). Learn more about building a seed phrase working with an offline calculator listed here. BIP39 specifies a list of 2048 words from which the mnemonic phrase is selected. https://directoryrecap.com/listings12997433/bip39-dice-5-essential-elements-for-bip39